Luminescence Behavior of GdVO4: Tb Nanocrystals in Silica Glass-Ceramics

Shuai Han,Sasa Yan,Danping Chen,Yanping Chen,Ying Du,Yiting Tao

doi:10.3390/cryst10050396

Abstract

Glass ceramics with GdVO4: Tb nanocrystals impregnated in the highly transparent silica glass were prepared by the porous glass and sintering process and confirmed by XRD, Raman spectrum, and TEM. Spectral analysis shows that there are multifarious energy transfer processes in GdVO4: Tb nanocrystals, such as VO43− → Tb3+, Gd3+ → VO43−, Gd3+ → VO43− → Tb3+, and Gd3+ → Tb3+, and the main one is VO43− → Tb3+. In this process, 3T1,2 → 1A1 transition of VO43− transfers the energy to Tb3+ and generates 5D3 → 7F6,5,4,3,2 and 5D4 → 7F5 transitions of Tb3+. The energy transfer efficiency is 29.5%, and the excitation wavelength range of Tb3+ ions can be shifted from 230–260 nm to 280–365 nm. This shows that GdVO4 can effectively change the excitation wavelength of Tb3+, which is conducive to the application of Tb3+ ions excited by LED light sources.

Highlights

In recent years, rare-earth ion doped phosphors have been widely studied due to their excellent luminescent properties
Tb3+ is to introduce a suitable sensitizer, which can transfer the energy absorbed from Light-Emitting Diode (LED) light source to Tb3+
T, no diffraction peak was observed except for the typical amorphous broad scattering observed except for the typical amorphous broad scattering patterns, which can be ascribed to the patterns, which can beInascribed glass substrate

Summary

Introduction

Rare-earth ion doped phosphors have been widely studied due to their excellent luminescent properties. Among many rare earth elements, the 5 D4 → 7 F5 transition of Tb3+ leads to a very strong green photoluminescence (PL) at around 545 nm. This kind of green fluorescence has strong potential applications in blue-green laser, undersea communication, and medical equipment [1,2]. Due to the strictly forbidden 4f → 4f transitions, the optimal excitation wavelength of Tb3+ is near 240 nm, which is too short for a commercial Light-Emitting Diode (LED) light source, directly affecting the application of Tb3+ ions [3,4]. A large number of reports have been focused on this aspect, mainly through Ce3+ or Eu2+ to sensitize Tb3+ [1,5,6]

Objectives

Discussion

Conclusion